SI3220-GQ Silicon Laboratories Inc, SI3220-GQ Datasheet - Page 81

• Manufacturer Part Number: SI3220-GQ
• Description: IC SLIC/CODEC DUAL-CH 64TQFP
• Manufacturer: Silicon Laboratories Inc
• Series: ProSLIC®r

Specifications of SI3220-GQ

• Function: Subscriber Line Interface Concept (SLIC), CODEC
• Interface: GCI, PCM, SPI
• Number Of Circuits: 2
• Voltage - Supply: 3.3V, 5V
• Current - Supply: 65mA
• Power (watts): 941mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: *
• Includes: Battery Switching, BORSCHT Functions, DTMF Generation and Decoding, FSK Tone Generation, Modem and Fax Tone Detection
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Monitor Channel
The Monitor channel is used for initialization and setup
of the Dual ProSLIC devices. It is also used for general
communication with the Dual ProSLIC by allowing read
and write access to the Dual ProSLIC devices registers.
Use of the monitor channel requires manipulation of the
MR and MX handshaking bits located in bits 1 and 0 of
the SC channel described. For purposes of this
specification, “downstream” is identified as the data sent
by a host to the Dual ProSLIC. “Upstream” is identified
Transm itter
FS
Receiver
MX
MX
MR
MR
Figure 56. GCI Highway Frame Structure for 16-Bit GCI Mode
16
B1
Sub-Frame
CH0
1st Byte
Figure 57. Monitor Handshake Timing
1st Byte
ACK
M
8
CH1
C/I
6
125
125 µs = 1 Frame
2nd Byte
µ
Rev. 1.0
MR
s
1
as the data sent by the Dual ProSLIC devices to a host.
The following diagram illustrates the Monitor channel
communication protocol. For successful communication
with the Dual ProSLIC, the transmitter should anticipate
the falling edge of the receiver’s acknowledgement.
This also maximizes communication speed. Because of
the handshaking protocol required for successful
communication, the data transfer rate using the Monitor
channel is less than 8 kbps.
MX
2nd Byte
1
ACK
CH2
3rd Byte
B2
16
3rd Byte
ACK
Si3220/Si3225
CH3
Unused
16
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